时移长偏移距瞬变电磁法剩余油监测方法及应用

Remaining oil detection with time-lapse long offset& window transient electromagnetic sounding

利用长偏移距瞬变电磁法(Lowtem)水平电场分量对高阻薄层电阻率变化灵敏这一地球物理特征,开展时移长偏移距瞬变电磁法剩余油监测试验。对时移长偏移瞬变电磁法资料采用归一化残差的方法进行处理,得到的结果突出了高阻薄层电阻率的变化。试验结果表明:采用时移Lowtem方法在试验区获取的电阻率残差图、剩余油预测平面分布图与已知的勘探和开发信息相吻合,初步表明时移长偏移距瞬变电磁法对剩余油边界的探测和预测具有良好的应用前景。

Since electrical field horizontal component in long offset & window transient electromagnetic(LOWTEM)data is sensitive to change of high resistivity of thin beds,we use time lapse LOWTEM to monitor remaining oil.In order to highlight high resistivity change of thin beds,the data of timelapse LOWTEM data is processed with normalized residual.According to our experiment results,resistivity normalized residual maps and remaining oilpredicted distribution maps obtained from timelapse LOWTEM are well matched with exploration and development information of the oilfield,which indicates that time-lapse LOWTEM will have bright prospects in remaining oil monitoring.